Succesfully using Shrewsoft VPN client from within the guest until I switched from IDE to SATA controller on the guest. When attempting to connect to the VPN with the Shrewsoft client the guest appears to freeze along with display corruption, although I have also experienced BSOD.

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I'm also having the same problem with the Cisco AnyConnect VPN client.

Host: Gentoo 64

Guest: Windows XP SP3 32

Using IDE/PATA for the drive connection it works fine, but if I move the system drive to a SATA connection then I get a freeze-up or crash as soon as VPN connects and tries to bring up the VPN interface.
If I leave the system drive on IDE and connect another drive to SATA the guest keeps working fine, but whatever drives are on the SATA connection disappear. I then tried refreshing the drives from within Intel's Rapid Storage management console but it could not re-detect the drives.

This used to work fine with Cisco's older VPN Client version 5.0.04.0300. But AnyConnect seems totally different, using another VPN virtual network interface even.